Prosecution Insights
Last updated: April 19, 2026

Examiner: BREWSTER, HAYDEN R

Tech Center 1700 • Art Units: 1700 1773 1779

This examiner grants 61% of resolved cases

Performance Statistics

61.2%
Allow Rate
-3.8% vs TC avg
566
Total Applications
+50.4%
Interview Lift
1276
Avg Prosecution Days
Based on 534 resolved cases, 2023–2026

Rejection Statute Breakdown

1.4%
§101 Eligibility
17.9%
§102 Novelty
42.4%
§103 Obviousness
31.0%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18552201 METHOD FOR TREATING FEED WATER USING A BIOSTRATUM AND FILTRATION MEDIA Non-Final OA DDP SPECIALTY ELECTRONIC MATERIALS US, LLC
18127027 ACTIVE MATERIAL SEPARATION APPARATUS Non-Final OA HONDA MOTOR CO., LTD.
18457508 FILTER FOR CONTROLLING PH OF PURIFIED WATER AND WATER PURIFIER INCLUDING THE SAME Non-Final OA COWAY Co., Ltd.
18564603 WATER SOFTENING DEVICE Non-Final OA MIDEA GROUP CO., LTD.
18017044 COMPOSITIONS AND METHODS FOR TREATING AQUARIUM WATER Final Rejection Spectrum Brands, Inc.
18305597 LOGIC FOR CONTROL OF WATER FLOW THROUGH A SCREEN ASSEMBLY Final Rejection Duperon Innovation LLC
18147954 BIOLOGICAL WASTEWATER PROCESSING SYSTEM AND METHOD FOR PROCESSING THE SAME Non-Final OA INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
18248885 WASTEWATER FOAM CONTROL AGENT Final Rejection Dow Global Technologies LLC
18564782 PURE WATER PRODUCTION METHOD AND PURE WATER PRODUCTION APPARATUS Non-Final OA ORGANO CORPORATION
18231531 METHOD FOR REMOVING A CONTAMINANT FROM WASTEWATER FROM AN INDUSTRIAL PLANT AND A SYSTEM FOR PERFORMING SUCH METHOD Non-Final OA YARA INTERNATIONAL ASA
18555099 WATER SOFTENER SYSTEM Non-Final OA NUVO RESIDENTIAL, LLC DBA NUVOH2O
18231266 ROLL-TYPE DEVICE FOR ELECTROCHEMICAL RECOVERY OF AMMONIA, AND METHOD FOR ELECTROCHEMICAL RECOVERY OF AMMONIA Non-Final OA Guangdong University of Technology
18565987 BLOOD PURIFICATION DEVICE Non-Final OA NIKKISO CO., LTD.
18536595 Method And Reactor Device For Disinfecting Water By Means Of UV Lighting Non-Final OA HYTECON AG
18013786 SYSTEM AND METHOD FOR WATER TREATMENT WITH VENTURI PLASMA DISCHARGE Final Rejection Onvector LLC
18509198 Anaerobic Migrating Blanket Reactor and Methods of Using the Same Non-Final OA Bennett Environmental, LLC
18246301 PROCESS FOR PREPARING EXTRACELLULAR VESICLES Non-Final OA Lonza Sales AG
18460196 Hot Tub Filterwell Dispersant Technology Non-Final OA King Technology, Inc.
18460181 Hot Tub Filterwell Dispersant Technology Non-Final OA King Technology, Inc.
18279604 AIR FLOW CONTROL IN A MEMBRANE AERATED BIOFILM REACTOR Non-Final OA OXYMEM LIMITED
18548274 ELECTROCHEMICAL NITROGEN AND PHOSPHORUS REMOVAL DEVICE AND METHOD Non-Final OA BEIJING DRAINAGE GROUP CO., LTD
18274523 METHOD FOR MEASURING PORE SIZE AND PORE SIZE DISTRIBUTION OF FILTER MEMBRANE Non-Final OA SHANGHAI UNIVERSITY OF ENGINEERING SCIENCE
18196885 Concentric Dual Drum Screen Non-Final OA Ovivo Inc.
18311007 EVAPORATION PANEL SYSTEMS AND METHODS Non-Final OA ECOVAP, INC.

Facing This Examiner?

IP Author analyzes examiner patterns and generates tailored response strategies with the highest chance of allowance.

Build Your Strategy

Sign in with your work email

Enter your email to receive a magic link. No password needed.

Personal email addresses (Gmail, Yahoo, etc.) are not accepted.

Free tier: 3 strategy analyses per month